Work Vehicle Travel Switching Speed Threshold to Reduce Shocks
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Solution Overview
Problem
Work vehicles experience shocks and require significant deceleration when switching between forward and backward travel modes, leading to prolonged switching times, especially during operations like dozer work that frequently alternate directions.
Innovation Solution
A work vehicle equipped with a vehicle speed detecting mechanism, a restrainer vehicle speed setter, and a switch restrainer that allows switching between forward and backward travel only when the vehicle speed is below a set threshold, and includes deceleration controllers to manage speed changes, ensuring smooth transitions with reduced shocks and rapid direction changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the forward/backward travel switching device is made switchable at higher vehicle speeds, then the switching time between forward and backward travel is reduced, but shocks occur during switching
Solution Approach 1:
The restrainer vehicle speed is made dynamically adjustable rather than fixed. The setting value changing mechanism allows the operator to modify the restrainer vehicle speed based on working conditions, enabling the system to adapt between prioritizing shock reduction (lower speed threshold) and prioritizing switching speed (higher speed threshold).
Solution Approach 2:
The patent changes the parameter of restrainer vehicle speed threshold to resolve the contradiction. By allowing this parameter to be adjusted, the system can flexibly balance between permitting switching at higher speeds (reducing switching time) and maintaining lower speeds (reducing shocks).
2Object-affected harmful factors
If the forward/backward travel switching device is restricted to low vehicle speeds, then shocks are prevented, but the switching time increases due to required deceleration
Solution Approach 1:
The restrainer vehicle speed threshold is made dynamically adjustable rather than fixed. This allows the system to adapt to different working conditions, enabling operators to prioritize either shock prevention or switching speed depending on the situation.
Solution Approach 2:
The patent changes the parameter of restrainer vehicle speed threshold to resolve the contradiction. By allowing this parameter to be adjusted, the system can flexibly balance between permitting switching at higher speeds (reducing switching time) and maintaining lower speeds (reducing shocks).
3Adaptability or versatility
If frequent forward and backward travel switching is performed during work operations, then operational flexibility is improved, but the cumulative switching time increases
Solution Approach 1:
The adjustable restrainer vehicle speed threshold enables dynamic adaptation to different work scenarios. For frequent switching operations, the threshold can be raised to allow switching at higher speeds, reducing cumulative switching time while maintaining operational flexibility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system enables smooth and rapid switching between forward and backward travel by controlling vehicle speed and clutch engagement, minimizing shocks and deceleration, thus enhancing operational efficiency.
Implementation Method 1
a hydrostatic, continuously variable transmission device configured to receive motive power from the engine, vary the motive power, and output the varied motive power
Implementation Method 2
a planetary transmission device configured to receive the motive power from the engine and the motive power from the continuously variable transmission device, composite (combine) the motive power from the engine and the motive power from the continuously variable transmission device, and output the composite motive power
Data Source
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AI summary
A work vehicle includes: a restrainer vehicle speed setter (71) configured to set a restrainer vehicle speed for preventing the switch of a forward/backward travel switching device (23) ; and a switch restrainer (70) configured to (i) permit the switch of the forward/backward travel switching device (23) while a detected vehicle speed is lower than the restrainer vehicle speed and (ii) prevent the switch of the forward/backward travel switching device (23) while the detected vehicle speed is a high speed not lower than the restrainer vehicle speed.